Selection of pump head
Thread Content
When using a pump to pump water, how is the horizontal pressure drop generally calculated? For example: medium-density water, using a 40 mm pipe, pumping vertically for 7 meters and horizontally for 100 meters – how should the pump be selected? ； What if the medium is changed to vegetable oil?
The pressure drop per 100 meters must first be calculated based on factors such as the flow velocity of the liquid, the Reynolds number, and the roughness of the pipe interior. Based on experience, for a 100-meter long pipe, if the flow rate is chosen appropriately, the head requirement is usually around 1-2 meters. If there are other pipe fittings, such as elbows, tees, check valves, etc., their equivalent lengths can be calculated and added directly to the total pipe length.
For a simple estimation, since less pressure is required for horizontal transport, a pump with a head of 20m will be sufficient.